EP1527907A2 - Selbstragender Luftreifen - Google Patents
Selbstragender Luftreifen Download PDFInfo
- Publication number
- EP1527907A2 EP1527907A2 EP04105211A EP04105211A EP1527907A2 EP 1527907 A2 EP1527907 A2 EP 1527907A2 EP 04105211 A EP04105211 A EP 04105211A EP 04105211 A EP04105211 A EP 04105211A EP 1527907 A2 EP1527907 A2 EP 1527907A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- tire
- bead
- rim
- pair
- carcass
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C3/00—Tyres characterised by the transverse section
- B60C3/04—Tyres characterised by the transverse section characterised by the relative dimensions of the section, e.g. low profile
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C17/00—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor
- B60C17/0009—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor comprising sidewall rubber inserts, e.g. crescent shaped inserts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C17/00—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor
- B60C17/0009—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor comprising sidewall rubber inserts, e.g. crescent shaped inserts
- B60C17/0018—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor comprising sidewall rubber inserts, e.g. crescent shaped inserts two or more inserts in each sidewall portion
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49481—Wheel making
- Y10T29/49492—Land wheel
- Y10T29/49494—Assembling tire to wheel body
Definitions
- the present invention is directed to a pneumatic tire, especially a radial tire, that is preferably also capable of running in conditions wherein the tire is operated at less than conventional inflation pressure. More specifically, the present invention is directed to a method of molding such a tire wherein the stresses of the tire generated during mounting, inflating, and loading are varied to affect the performance of the tire.
- Self-supporting run-flat tires have been commercialized for many years.
- the primary characteristic of such tires is an increase in the cross-sectional thickness of the sidewalls to strengthen the sidewalls.
- These tires when operated in the uninflated condition, place the reinforcing sidewall inserts in compression. Due to the large amounts of rubber required to stiffen the sidewall members, heat build-up is a major factor in tire failure. This is especially true when the tire is operated for prolonged periods at high speeds in the uninflated condition.
- US-A- 5,368,082 teaches the employment of special sidewall inserts to improve stiffness.
- the required supported weight for an uninflated luxury car tire having an aspect ratios in the 55% to 65% range or greater, approximates 1400 Ibs load.
- Such higher loads for larger run-flat tires meant that the sidewalls and overall tire had to be stiffened to the point of compromising ride.
- luxury vehicle owners simply will not sacrifice ride quality for runflat capability.
- the engineering requirements have been to provide a runflat tire with no loss in ride or performance. In the very stiff suspension performance type vehicle the ability to provide such a tire was comparatively easy when compared to luxury sedans with a softer ride characteristic.
- Light truck and sport utility vehicles although not as sensitive to ride performance, provide a runflat tire market that ranges from accepting a stiffer ride to demanding the softer luxury type ride.
- the present invention is directed to a tire according to claim 1 and a tire and rim combination according to claim 7.
- the preferably self-supporting tire is molded in such a manner that ride comfort is improved, durability is increased, and a greater run-flat capability can be achieved.
- the tire is molded such that the molded bead base width is equal or less than the rim width of the intended rim upon which the tire is to be mounted.
- inserts are not subjected to additional stress upon inflation. This in effect, changes the loading on the inserts and the carcass ply, leading to improved tire characteristics.
- the tire has inserts in each sidewall located axially inward of the carcass reinforcing ply structure, or may have a pair of inserts, with one insert located axially inward of the carcass reinforcing ply structure and another located axially outward of the carcass reinforcing ply structure.
- Apex means an elastomeric filler located radially above the bead core and between the plies and the turnup ply.
- “Circumferential” means lines or directions extending along the perimeter of the surface of the annular tire parallel to the Equatorial Plane (EP) and perpendicular to the axial direction.
- Design rim width is the specific commercially available rim width assigned to each tire size.
- “Self-supporting run-flat” means a type of tire that has a structure wherein the tire structure alone is sufficiently strong to support the vehicle load when the tire is operated in the uninflated condition for limited periods of time and speed, the sidewall and internal surfaces of the tire not collapsing or buckling onto themselves, without requiring any internal devices to prevent the tire from collapsing.
- Standard wall insert means elastomer or cord reinforcements located in the sidewall region of a tire; the insert being in addition to the carcass reinforcing ply and outer sidewall rubber that forms the outer surface of the tire.
- “Spring Rate” means the stiffness of tire expressed as the slope of the load deflection curve at a given pressure.
- FIG. 1 is a self supporting run-flat tire 10 in accordance with the present invention. Only one half of the cross-sectional configuration of the tire is illustrated. It will be readily understood by those in the art that the non-illustrated half of the tire is the mirror-image of that which is illustrated, absent any specific indication of an asymmetrical tire.
- the tire 10 has a carcass comprising a reinforcing ply 12 that extends from one bead portion 14 to an opposing bead portion 14. The ends of the reinforcing ply 12 pass radially inward of an inextensible bead core 16 and form a tum-up portion 18 that extends toward the maximum sectional width or the mid-height of the tire 10.
- a bead apex 20 In the bead portion 14, and radially outward of the bead core 16 and between the main portion of the reinforcing ply 12 and the tum-up portion 18 is a bead apex 20.
- the apex 20 is typically formed of a relatively high Shore A hardness material.
- Each bead portion 12 is defined by a bead base 22, a bead toe 24, and a bead heel 26.
- the bead base 22 is the approximately cylindrical portion of the bead portion 12 that forms its inside diameter.
- the bead toe 24 is the part of bead portion 12 that joins the bead base 22 and the inside surface of the tire 10 and is axially inward of the bead heel 26; the bead heel 26 being the part of the bead portion 12 that joins the bead base 22 and the outer surface of the tire 10.
- the molded bead width BW is the axial distance measured between opposing bead heels 26.
- the bead portion may also include other non-illustrated elements such as flippers, chippers, toe guards and chafers.
- the illustrated belt structure 28 Radially outward of the main portion of the carcass reinforcing ply 12 is a belt structure 28.
- the illustrated belt structure 28 has two plies 30 formed from inclined parallel reinforcing cords.
- the cords are preferably inclined at an angle of 17° to 27° relative to the equatorial plane EP of the tire 10.
- the cords in each ply 30 are crossed at an equal and opposing angle to the cords in the adjacent ply 30.
- Outward of the two inclined cord plies 30 is an overlay 32.
- the overlay 32 is formed of cords inclined at 0° to 5° relative to the equatorial plane EP. While illustrated radially outward of the inclined cord plies 30, the overlay 32 may actually be located between the inclined cord plies 30 or radially inward of the inclined cord plies 30.
- the tread 34 that forms the ground contacting surface of the tire. Extending from the tread edges 36 are the tire sidewalls 38. The lower portion of the sidewall is defined by a protective rib 40. The location of the protective rib 40 is dependent on the tire height; the rib 40 is located relatively higher up the sidewall 38 when the tire height is smaller, and the rib 40 is located relatively lower along the sidewall 38 when the tire height is greater.
- Axially inward of the carcass reinforcing ply 12 and in the sidewall 38 of the tire 10 is an elastomeric insert 42.
- the shape of the insert 42 is described as being substantially crescent in shape, or lenticular. This is intended to also include an entrunkated crescent shape, particularly where the entrunkated portion of the crescent shaped insert is juxtapositioned to the tire's bead portion.
- the insert 42 preferably has a maximum thickness B at a location between the tread edge and the radial location of the maximum section width of the tire. The function of the insert 42 is to stiffen/support the sidewall 38 of the tire 10 when the tire 10 is operated at reduced or insignificant inflation pressure.
- the rubber based inserts 42 are elastomeric in nature having a substantially crescent cross-sectional shape and material properties selected to enhance inflated ride performance while promoting the tire's run-flat durability.
- the inserts 42 may also be individually reinforced with cords or short fibers. Thus, one or more of such inserts 42 may be so reinforced.
- the insert 42 has a Shore A hardness at 100° C in a range of 65 to 90.
- the properties disclosed in US-A- 6,230,773 are suitable for the insert 42 of the present invention. The properties may be achieved by the compound disclosed in the referenced US patent, or other compounds may be selected which yield the disclosed properties.
- FIG. 2 shows the tire 10 of FIG. 1 mounted on a tire rim 50.
- the tire rim 50 has a design and rim width as specified by the industry standards in effect in the world region in which the rim 50 and tire 10 are to be used. Where the tire rim 50 contacts the tire 10, the rim 50 has two main components, the bead seat 52 and the rim flange 59, the seat 52 and flange 59 connecting at a point C.
- the rim 50 has a maximum axial width RW.
- the molded bead width BW is less than or equal to the rim width RW.
- tire/rim combination having the molded base width greater than the rim width i.e. the conventional combination, is used as the reference tire/wheel combination.
- Tire / Rim Combination Reference A B C Molded Bead width 7.5 7.0 7.5 7.0 Rim width 7.0 7.0 7.5 7.5 Inflated Condition Vertical Deflection, mm 19.57 20.82 19.83 21.13 Vertical Stiffness, N/mm 242.1 227.4 240.7 220.5
- the decreased spring rate, and thus, less stiff tire during inflated operation, may be partially due to a new crown contour generated when the molded bead width is reduced, see FIG. 3.
- the outline of the two tires is for identical constructed tires, except that tire M is molded with a bead width equal to the tire rim width, while tire P is molded with a bead width greater than the tire rim.
- the two outlines are matched at the equatorial plane EP of the tires M, P.
- the crown contour is changed, radially dropping the shoulder 60 of the tire M and bringing the maximum section width of the tire M axially inward, relative to the conventional tire P.
- this change in contour can result in a tire mass reduction of about 300 grams.
- a change in crown contour and a corresponding reduction in tire mass is also expected.
- Table 2 shows the strain energy density (SED) for the sidewalls of the conventional run-flat tire/rim and tire/rim combination A.
- the SED is measured during inflated and loaded conditions.
- the strain is at a maximum at the axially inner portion of the insert located on the tread side of the maximum section width of the tire. This maximum SED occurs at the tire location where the tire will flex the greatest amount during deflated operation.
- the maximum SED is in the same general location as for the conventional tire/rim combination; however, the SED is significantly reduced, by approximately 27.5%, and is more evenly spread out through the tire sidewall 38.
- the bending stiffness of the apex region is lower, as the apex 20 is not forced to bend outward during mounting.
- the apex 20 is not pre-loaded and is able to share some of the bending of the sidewall 38, distributing any deformation over a larger area. This in effect softens the sidewall beam structure created by the combination of the insert, apex, and ply, hence more inflated vertical deflection.
- FIGS. 4a and 4b depict alternative constructions for the run-flat tire.
- the carcass reinforcing structure has two plies 12.
- the insert 42 is located between the two plies 12.
- the first and radially inner insert 44 being located between the inside of the tire 10 and the first carcass ply 12 and the second and radially outer insert 46 being located between the two plies 12.
- the total gauge of the two inserts 44, 46 has a gauge corresponding to the maximum gauge range for a single insert 42 of the other illustrated tires, such as that of FIG. 1 or 4a.
- the maximum gauge for the inserts is 4.0 to 10.5 mm.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/696,620 US7093633B2 (en) | 2003-10-29 | 2003-10-29 | Self-supporting pneumatic tire |
US696620 | 2003-10-29 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1527907A2 true EP1527907A2 (de) | 2005-05-04 |
EP1527907A3 EP1527907A3 (de) | 2008-08-20 |
Family
ID=34423375
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04105211A Withdrawn EP1527907A3 (de) | 2003-10-29 | 2004-10-21 | Selbstragender Luftreifen |
Country Status (5)
Country | Link |
---|---|
US (1) | US7093633B2 (de) |
EP (1) | EP1527907A3 (de) |
JP (1) | JP2005132361A (de) |
AU (1) | AU2004222745A1 (de) |
BR (1) | BRPI0404433A (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2925393A1 (fr) * | 2007-12-21 | 2009-06-26 | Michelin Soc Tech | Pneumatique pour roulage a plat pourvu d'une armature supplementaire de flanc. |
EP2565058A1 (de) | 2011-09-02 | 2013-03-06 | The Goodyear Tire & Rubber Company | Selbsttragender Luftreifen |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100655927B1 (ko) | 2005-07-07 | 2006-12-08 | 한국타이어 주식회사 | 자체 지지형의 공기입 런 플랫 타이어 |
US20120312442A1 (en) * | 2011-06-13 | 2012-12-13 | Kiyoshi Ueyoko | Reduced weight aircraft tire |
US8567465B2 (en) | 2011-09-02 | 2013-10-29 | The Goodyear Tire & Rubber Company | Self-supporting pneumatic tire |
US8590586B2 (en) | 2011-09-02 | 2013-11-26 | The Goodyear Tire & Rubber Company | Self-supporting pneumatic tire |
JP2013180651A (ja) * | 2012-03-01 | 2013-09-12 | Bridgestone Corp | 空気入りタイヤ |
FR2989032B1 (fr) * | 2012-04-05 | 2015-04-10 | Michelin & Cie | Pneumatique et ensemble pneumatique-roue a mobilite etendue |
CN106029400B (zh) | 2014-02-18 | 2018-09-25 | 普利司通美国轮胎运营有限责任公司 | 低压实悬臂式轮胎 |
WO2016130347A1 (en) | 2015-02-11 | 2016-08-18 | Bridgestone Americas Tire Operations, Llc | A runflat tire with sidewall-reinforcing inserts |
JP6724369B2 (ja) * | 2016-01-08 | 2020-07-15 | 住友ゴム工業株式会社 | 空気入りタイヤ |
WO2018009606A1 (en) * | 2016-07-06 | 2018-01-11 | Bridgestone Americas Tire Operations, Llc | Post-cure sidewall stabilizing reinforcement and method of manufacturing |
AU2017228601B2 (en) * | 2016-09-25 | 2023-03-23 | The Goodyear Tire & Rubber Company | Heavy duty tyre |
FR3079843B1 (fr) | 2018-04-09 | 2020-10-23 | Michelin & Cie | Pneumatique avec bourrelets comprenant une composition de caoutchouc specifique |
FR3085954B1 (fr) | 2018-09-17 | 2020-09-11 | Michelin & Cie | Pneumatique avec bourrelets comprenant une composition de caoutchouc specifique |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4481994A (en) * | 1978-12-15 | 1984-11-13 | Compagnie Generale Des Etablissements Michelin | Tire with prestressed radial carcass reinforcement |
US4867218A (en) * | 1986-12-18 | 1989-09-19 | Sumitomo Rubber Industries, Ltd. | Radial tire profile |
US5117886A (en) * | 1989-03-15 | 1992-06-02 | Bridgestone Corporation | Pneumatic radial tire for passenger cars |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4070436A (en) * | 1976-10-20 | 1978-01-24 | The Firestone Tire And Rubber Company | Method of manufacturing a pneumatic tire |
US4345634A (en) * | 1980-06-04 | 1982-08-24 | Michelin Recherche Et Technique S.A. | Tire for medium and heavy carrier vehicles |
US4513802A (en) * | 1982-03-16 | 1985-04-30 | Bridgestone Tire Company Limited | Reduced rolling resistance pneumatic radial tire and method of manufacturing the same |
JPS61113503A (ja) * | 1984-11-06 | 1986-05-31 | Bridgestone Corp | 操安性のよい乗用車用空気入りタイヤ |
US5445202A (en) * | 1993-08-31 | 1995-08-29 | The Goodyear Tire & Rubber Company | Radial ply tire with specified bead portion fitment to design rim |
US6230773B1 (en) * | 1998-03-17 | 2001-05-15 | The Goodyear Tire & Rubber Company | Tire with sidewall carcass reinforcement |
JP4608108B2 (ja) * | 2001-01-12 | 2011-01-05 | 住友ゴム工業株式会社 | ランフラットタイヤ |
JP4648560B2 (ja) * | 2001-04-04 | 2011-03-09 | 住友ゴム工業株式会社 | ランフラットタイヤ |
-
2003
- 2003-10-29 US US10/696,620 patent/US7093633B2/en not_active Expired - Fee Related
-
2004
- 2004-10-15 AU AU2004222745A patent/AU2004222745A1/en not_active Abandoned
- 2004-10-18 BR BR0404433-9A patent/BRPI0404433A/pt not_active IP Right Cessation
- 2004-10-21 EP EP04105211A patent/EP1527907A3/de not_active Withdrawn
- 2004-10-29 JP JP2004315236A patent/JP2005132361A/ja active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4481994A (en) * | 1978-12-15 | 1984-11-13 | Compagnie Generale Des Etablissements Michelin | Tire with prestressed radial carcass reinforcement |
US4867218A (en) * | 1986-12-18 | 1989-09-19 | Sumitomo Rubber Industries, Ltd. | Radial tire profile |
US5117886A (en) * | 1989-03-15 | 1992-06-02 | Bridgestone Corporation | Pneumatic radial tire for passenger cars |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2925393A1 (fr) * | 2007-12-21 | 2009-06-26 | Michelin Soc Tech | Pneumatique pour roulage a plat pourvu d'une armature supplementaire de flanc. |
WO2009080587A1 (en) * | 2007-12-21 | 2009-07-02 | Societe De Technologie Michelin | Run-flat tyre having an additional sidewall reinforcement |
EA016537B1 (ru) * | 2007-12-21 | 2012-05-30 | Сосьете Де Текноложи Мишлен | Самонесущая шина, имеющая дополнительный усилитель боковины |
CN101903197B (zh) * | 2007-12-21 | 2012-08-29 | 米其林技术公司 | 具有附加胎侧增强件的漏气保用轮胎 |
US8578987B2 (en) | 2007-12-21 | 2013-11-12 | Compagnie Generale Des Etablissements Michelin | Run-flat tire having an additional sidewall reinforcement |
EP2565058A1 (de) | 2011-09-02 | 2013-03-06 | The Goodyear Tire & Rubber Company | Selbsttragender Luftreifen |
Also Published As
Publication number | Publication date |
---|---|
BRPI0404433A (pt) | 2005-06-21 |
US20050092415A1 (en) | 2005-05-05 |
JP2005132361A (ja) | 2005-05-26 |
AU2004222745A1 (en) | 2005-05-19 |
EP1527907A3 (de) | 2008-08-20 |
US7093633B2 (en) | 2006-08-22 |
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Legal Events
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